In a civil lawsuit, the woman accuses Foster of sexual assault, battery, false imprisonment and intentional infliction of emotional distress.
Her suit alleges the assault happened Jan. 24 at University Place Hotel at Indiana University-Purdue University in Indianapolis. The woman is a student at the school and a receptionist at the hotel.
In February, Marion County (Ind.) prosecutor Carl Brizzi said he would not file criminal charges against Foster.
The suit alleges that Foster assaulted the woman when she delivered dental products to his room.
The Colts were staying at the hotel before hosting the New York Jets at Lucas Oil Stadium.
"We will look at the facts but will not speculate what, if any, action could be taken" against Foster under the league's personal conduct policy, NFL spokesman Greg Aiello said Tuesday.
Colts spokesman Craig Kelley declined to comment Tuesday on the lawsuit.
The victim's attorney, April Board, told the Chicago Sun-Times that the IUPUI police department mishandled the case, forcing her client to turn to the civil courts.
"It's so far afield from the standard operating procedure of any police department -- I don't care if it's the tiniest town in Indiana or New York City," Board said, according to the report.
"They didn't take [the victim's] uniform. They don't talk to Eric Foster. They don't look at surveillance film. They don't cordon off the room and look for evidence, either," Board said, according to the report. "These cases are hard enough to prosecute when you do everything right."
An IUPUI dispatcher said a spokesman would not be available for comment until Tuesday morning, according to the Sun-Times.
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